How much can be made from buying cheap and selling high.
The PJM marketplace is where our energy is bought and sold.
battery efficiency for grid
google.com
https://css.umich.edu/publications/factsheets/energy/us-grid-energy-storage-factsheet#:~:text=The%20U.S.%20has%20575%20operational,between%2085%2D87%2524.
Grid energy storage
wikipedia.org
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